After copying text files from Windows to Linux/Unix, there is always a ^M character at the end of each line when the file is viewed/edited on Linux. Is there any effective way to remove the ^M characters by scripts?

Thanks.

i think sed s/\r\n/\n/g will work .. i've seen similar posting few days ago.. search with 'php sed'

I will try your solution to see how it works. Thanks, doublefailure.

P.S. I did search with 'php sed', but didn't find any similar posting regading this issue. Could you send me the links if you see any?

search with 'teaching php'
there's one

also if u use emacs/xemacs
put this in your init file
and emacs will prompt u if it finds ^M in a file u open

(add-hook 'find-file-hooks 'remove-or-convert-trailing-ctl-M)
(defun remove-or-convert-trailing-ctl-M ()
"Propose to remove or convert trailing ^M from a file."
(interactive)
(save-excursion
(goto-char (point-min))
(if (search-forward "\^M" nil t)

(if (or (= (preceding-char) ?\^J)
(= (following-char) ?\^J) )

(if
(y-or-n-p "Remove trailing ^M ? ")
(progn (goto-char (point-min))
(perform-replace "\^M" "" nil nil nil)
(pop-mark) )
(message "No transformation.") )
(if (y-or-n-p "Convert ^M into ^J ? ")
(progn (goto-char (point-min))
(perform-replace "\^M" "\^J" nil nil nil)
(pop-mark) )
(message "No transformation.") ) )

)
))

That's very helpful. thanks again, df

Another old trick to remove the unneeded carriage returns was/is:

cat old-dos-file.txt | col > converted-file.txt

Can't have too many tricks in your bag.